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Mass Transfer

Mass Transfer
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

Natural
None of these
Induced
Forced

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Mass Transfer
The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature.

Dew point
Wet bulb
None of these
Dry bulb

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Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

2
1
0.56
1.56

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Mass Transfer
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Either A or B; depends on the gas
Remains same
Increases
Decreases

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Mass Transfer
The fixed cost of a distillation column at minimum reflux ratio is

Infinite
None of these
Minimum
Optimum

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

Plug
Perfectly mixed
Both plug & perfectly mixed
None of the listed here

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